Gear-wheel



(No Model.) 2 Sheets-Sheet 1.

M. T. GRAF. GEAR WHEEL.

No.-40s,101. Patented Ma 14,1889.

(No Model.) Y 2 Sheets-Sheet2.

M. T.. GRAF'. GEAR WHEEL.

No. 403,101. Patented May 14, 1889..

f 2 l .hmxA PM UNITED STATES PATENT OFFICE.

MARTIN T. GRAF, OF BUFFALO, NEW YORK.

GEAR-WHEEL.

SPECIFICATION forming part of Letters Patent No. 403,191, dated May 14,1889.

Application filed August 13, 1888. Serial No. 282,527. (No model.)

To all whom it may concern.-

Be it known that I, MARTIN T. GRAF, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York,

have invented certain new and useful Improvements in Gear-Wheels; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it ap- Io pertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, Which form a partof this specification.

The object of my invention is to provide a I 5 gear-wheel more particularly for roller-mills for grinding grain, which is so constructed that it will prevent the noise and rattle common to the ordinary type of gear-wheel now in use; and to that end it consists of a certain construction which I will now proceed to definitely describe and claim.

In the drawings, Figure 1 is a transverse central section taken in the line a: x of Fig. 3. Fig. 2 is a section taken in the line y y of Fig. 3. Fig. 3 is a partial face view of my improved gear-wheel partially broken away, and Fig. 4 is an edge view of the same.

Referring to the drawings, a is a sleeve keyed to the shaft 1), upon which it is mounted, as seen at a, Fig. 3.

c is the hub proper of the wheel, between which and the sleeve a is placed packing material, 0, preferably of leather or rubber, to prevent'jarring or vibrating of parts. The hub has an outwardlyextending web, and is rigidly secured to the sleeve by means of the keys cl, preferably two on each side, which are placed in registering recesses in the sleeve and hub and there held by the screw-bolts d, 40 which pass through the keys (2 and into the sleeve a, as clearly shown in Fig. 1. The three contacting sides of the keys are lined wit-h packing, c, to prevent jarring or vibrating, and washers (1 hold the packing against accidental displacement.

In the manner just described I have provided a hub which is compact, rigid, and nonsonorous.

As clearly shown in Fig. 1, the web has upon its outer righthand side and integral with it the hollow enlargement 6, having the inside annular recess, e, and the teeth e fis a circumferential rim similar in construction to the enlargement e, provided with the inside annular recess, f, and teeth f This rim f is fitted in the recess e in the hub c and rigidly secured at intervals to the part c by the rivets When these parts e and f are put together, the chamber formed by the recesses e and f is filled With sand. The teeth c and f are of the same size and shape, and when the parts e and f are secured together they are so placed that each tooth of one part registers accurately with each open space between the teeth of the other part, as clearly shown in Figs. 3 and 4. In addition to this a circumferential space, 70, equal to the depth of the teeth, and formed by offsets upon the ring and the main portion, is left between the two series of teeth.

A gear-wheel constructed as just described is essentially non-vibrating, and consequent ly non-sonorous, as the packing material in the hub and sand-filled chamber effectually prevents vibration of parts, and the peculiar arrangement of teeth in my improved wheel enables it to engage closely and accurately with another wheel of similar construction,

thus preventing what is known as backlashing, which causes the annoying rattle in all machines provided with the ordinary form of gear-Wheel, and particularly in roller-mills and other machines which are run at a high rate of speed. The space is between the two sets of teeth prevents injurious contact between the teeth of two Wheels should'a slight lateral displacement occur.

I am aware of a gear-Wheel having two sets of teeth arranged in the same manner as mine with respect to each other and having a web between them extending up to the pitch-line to form a bearing-surface, and I do not, therefore, lay claim to such construction. The space between the teeth of my wheel extends down to the bottom line of the teeth, thereby avoiding the bearing-surface, for the reason that with it my improved wheel would be utterly useless for the work intended for it.

I claim 1. A gear-wheel having two annular series of teeth of corresponding size and shape around its periphery and having a circumferential space between the two sets of teeth, formed by offsets upon the ring and main portion, the teeth of one series exactly registering with the open spaces between the teeth of the other series, as set forth.

2. A gear-Wheel comprising a central sleeve, a hub, an outwardly-extending web, two annular series of teeth of corresponding size and shape, the teeth of one series registering with the spaces between the teeth of the other series, and a circumferential chamber interposed between the teeth and the hub and having a non-sonorous filling, substantially as set forth.

3. A gear-wheel comprising a hub, an outwardly-extending Web having an annular recessed enlargement, said annular recessed portion constituting a portion of the rim of the wheel and having a circumferential series of teeth, and an annular recessed ring constitutingthe remaining portion of the rim and having a circumferential series of teeth, said rim or ring fitting within the recessed side of the web and being secured in position, as described.

4. A gear-wheel having two annular series of teeth upon separable parts, each part having an annular recess, one part formed integrally with a web extending from the hub and the other part separately therefrom and removably attached thereto.

5. A gear-wheel having two annular series of teeth upon separable parts of the rim of the wheel, each part having an annular recess, one part formed integrally with the hub and the other part separately therefrom and removably attached thereto, the respective parts forming a sand-chamber between them, and the two series of teeth having a circumferential division-space, as set forth.

6. A gear-Wheel comprising the sleeve, rim, and hub described, keys (I, and securing-bolts connecting said sleeve and hub together, and a non-sonorous material interposed between the adjacent contact-surface of the sleeve, hub, and keys, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

MARTIN T. GRAF.

\Vitnesses:

\V. T. MILLER, Or'ro I-IoDDIoK. 

